Pat Farrell;224387 Wrote: > 4mula1 wrote:[color=blue] > Microwave ovens use 2.4gHz because that is a frequency the resonates > the bond between the hydrogen and oxygen atoms in water. So it makes > things cook fast.
Sigh... When will this myth get stamped out. 2.4 GHz is not any exact bond resonant frequency. The effect of microwaves here is dielectric heating of any polar molecules. 2.4 GHz was chosen somewhat for historical reasons by virtue of being an unlicensed industrial frequency that is a good compromise between absorbtion and penetration in water/most foods. It is also capable of being created by magnetrons and waveguides of a reasonable size for a small appliances. Commercially there are other frequencies used, I think 900 MHz is one. Although there are absorbtion peaks for water (again these are not any unique resonance since there are many different vibration and rotation modes all "smeared" together in liquid water), one near 3 GHz IIRC and, as mentioned above, it would actually be undesireable to hit them and have most of the energy dumped into the outer layers of your food. -- Daryle Tilroe ------------------------------------------------------------------------ Daryle Tilroe's Profile: http://forums.slimdevices.com/member.php?userid=434 View this thread: http://forums.slimdevices.com/showthread.php?t=38091 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/discuss
